SHELBY, MS, USA
N73089
AIR TRACTOR AT-301A
WHILE ON AN AERIAL APPLICATION FLT DURING THE GROUND ROLL TO TAKEOFF, THE FORWARDMOST OF TWO MAIN GEAR CLAMP BLOCK BOLTS OF THE RT MAIN LANDING GEAR FAILED. THE GEAR TRAILED AFT. THE INBOARD MAIN GEAR LARGE BOLT FAILED. THE ACFT TRAVELLED OFF THE RWY INTO A SOY BEAN FIELD AND NOSED OVER. EXAMINATION OF THE BOLTS REVEALED NO EVIDENCE OF PRE-EXISTING FAILURE. ACCORDING TO THE ACFT MAINTENANCE MANUAL BOTH THE FAILED BOLTS SHOULD BE REPLACED AT A MAXIMUM OF 600 HRS & A MINIMUM OF 300 HRS, DEPENDING ON THE GENERAL LANDING FIELD CONDITIONS. ACCORDING TO THE OPERATOR OF THE ACFT, BOTH BOLTS HAD ACCUMULATED APRX 670 HRS SINCE REPLACEMENT.
Source: NTSB Aviation Accident Database
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